psychoactive drug
mind-altering drug
consciousness-altering drug
psychoactive substance

Its long-term effects, though, seem to be similar to those of some psychoactive drugs.

U-92,016-A is a psychoactive drug and research chemical used in scientific studies.

These patterns change if only a few members receive psychoactive drugs.

There are many ways in which psychoactive drugs can affect the brain.

As a psychoactive drug it is more powerful in one respect than heroin.

It is also a psychoactive drug and one of the oldest recreational drugs.

He didn't recognize all the names on the bottles, but the psychoactive drugs were strong.

It is unquestionably the most widely used psychoactive drug on earth.

But were his psychoactive drugs truly therapeutic, or merely political in their effect?

I was more worried about the risks of using a psychoactive drug after a brain injury.